package wj.jdbc;

import java.sql.*;
import java.util.Scanner;

public class AppLogin {
    public static void main(String[] args) throws Exception{
        System.out.println("请输入账号:");
        Scanner scanner = new Scanner(System.in);
        String username = scanner.nextLine();
        System.out.println("请输入密码:");
        String password = scanner.nextLine();
        loginPlus(username,password);
    }

    public static void login(String u, String p) throws Exception{
        System.out.println("username="+u);
        System.out.println("password="+p);
        String sql = "SELECT id FROM user WHERE `username` = '" +u+
                "' AND `password` = MD5('" +p+
                "')";
        System.out.println("SQL语句是"+sql);
        Class.forName("com.mysql.jdbc.Driver");
        String url = "jdbc:mysql://localhost:3306/test?useSSL=false";
        String username = "root";
        String password = "root";
        Connection connection = DriverManager.getConnection(url, username, password);
        Statement statement = connection.createStatement();
        ResultSet set = statement.executeQuery(sql);
        if(set.next()){
            System.out.println("登录成功！");
        }else{
            System.out.println("登录失败！");
        }

    }

    public static void loginPlus(String u, String p) throws Exception{
        System.out.println("username="+u);
        System.out.println("password="+p);
        String sql = "SELECT id FROM user WHERE `username` = ? AND `password` = MD5(?)";
        Class.forName("com.mysql.jdbc.Driver");
        String url = "jdbc:mysql://localhost:3306/test?useSSL=false";
        String username = "root";
        String password = "root";
        Connection connection = DriverManager.getConnection(url, username, password);
        PreparedStatement ps = connection.prepareStatement(sql);
        ps.setString(1,u);
        ps.setString(2,p);
        ResultSet set = ps.executeQuery();
        if(set.next()){
            System.out.println("登录成功！");
        }else{
            System.out.println("登录失败！");
        }


    }
}
